Remark Of course, the requirement that \(\beta \)  is integer valued is just a restatement of the ad hoc quantization conditions familiar from the old quantum mechanics of Bohr and Sommerfeld. At this stage of the ED approach, there are no such restrictions on \(\beta \) , nor should they be expected. This, instead, comes from the requirement that the wave function \(\Psi \)  be single valued. A more complete discussion of this issue in ED is given in [1]}.

